Information Technology Reference
In-Depth Information
To show the times at which an event actually occurred, we draw radial
lines from the event. Fig. 4.4 shows an example where time-stamps of the
“got home” event are represented by radial lines. Showing these radial
lines, we can understand when the events occurred and appreciate their
time-stamp distribution. Using these additional lines provides more
information, but may cause the visual representation to become
complicated. Therefore, these lines should be drawn temporarily according
to a user operation, such as a mouse click.
If the event is divided into multiple categories, it is difficult to see the
whole set of events, because semantically similar events are displayed in a
dispersed manner. In this case, as shown in Fig. 4.5, we connect the events
by a straight line. In this way, we can notice whether events occur at
similar or different times.
Development of the tool
We have developed a visual tool to enable ChronoView to support the
analysis of data with temporal information, using tweet data from Twitter
as an example. Fig. 4.6 shows an overview of the tool.
ChronoView window
Our visual tool places ChronoView in the centre of the window. The tool
provides three types of view: all view , weekday-and-holiday view , and day
view .
All view shows all of the collected data, with each light-blue circle
expressing an event. If we click on a circle, radial lines are drawn from the
circle, as shown in Fig. 4.4, allowing us to understand the actual
occurrence times of the event.
In weekday-and-holiday view (see Fig. 4.3), events are divided into
two categories: events on weekdays and events on holidays. Each light-
blue circle expresses an event on a weekday and each pink circle expresses
an event on a holiday. In this view, we can search for differences between
occurrences on weekdays and holidays. If we click on a circle that we
want to focus on, identical events are connected by a straight line. In this
way, we can notice features about the same events that belong to the
different categories.
In day view (see Fig. 4.7), events have been divided into seven
categories, i.e., one for each day of the week. Events on different days are
assigned a unique colour. If we click on a circle that we want to focus on,
similar to the weekday-and-holiday view, identical events are connected by
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